After having replayed the game just recently I honestly think that WC3 holds up pretty well. I certainly wouldn't say no to a visual overhaul (even if it was just done within the existing engine's limitations) but I think that by adding smaller features through patches, like a proper widescreen support, a slightly reworked UI (it's huuuge), built-in grid hotkeys, ... the game would be perfectly fine. Obviously when talking about competitive there are other things that need to get addressed (map pool, maybe balance, cheat prevention, ...) but I don't think that the game really needs a remaster to get old or even new players interested in the game.